Voltaire has some of the coldest winter nights among U.S. towns
In July the day’s top temperature is typically 82°. June is the wettest month, January the driest. It is a dry place: less rain and snow fall here than on 91% of U.S. towns. Garden planting can start around May 22; autumn frost returns near September 22.
A year in Voltaire at a glance
Each month’s typical high and low, and what it brings.
What stands out about Voltaire’s climate
Compared with towns across the U.S., with Voltaire’s place in North Dakota beside it.
What a year in Voltaire feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 123 frost-free days a year
In half of years the last 32° night comes by May 22 and the first by September 22. Frost and day counts come from NOAA’s station at Velva, ND, 5 miles from the town’s center, at about the same height.
The 2023 USDA map puts Voltaire’s center in zone 4a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −28°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 41 inches of snow a winter
Snow, measured at Velva, ND, falls mostly in January and December. Precipitation (rain plus melted snow) adds up to 18 inches a year; June is the wettest month and January the driest. Rain or snow falls on about 57 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Voltaire
97% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through May.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Velva, ND.
Living with Voltaire’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
123 frost-free days in zone 4a. The last frost comes by May 22 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Sep 22.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September.
Parks & trails →Cold waves are 36% of the yearly building losses FEMA expects in Voltaire from natural hazards, the largest share. Normals are averages; the hazards page covers the extremes.
Natural hazards →Voltaire and its neighbors
Every town next door is within a degree of Voltaire in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Voltaire’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Voltaire, ND | 1° | 82° | 18" | 41" |
| East Grand Forks, MN | −2° | 81° | 23" | 49" |
| Aberdeen, SD | 3° | 84° | 22" | 43" |
| Gunnison, CO | 0° | 82° | 12" | 50" |
| Sidney, MT | 4° | 85° | 15" | 30" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Voltaire averaged 1.0° warmer than the 1900s. The biggest change is in January (+4.2°).
A smaller shift than in 78% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Voltaire compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Voltaire’s place among North Dakota’s.
Voltaire weather by month
Highs, lows and precipitation from NOAA’s grid at Voltaire’s center; snow, wet days and snow on the ground from Velva, ND. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 19° | 1° | 0.5" | 10.3" | 3 | −4° – 27° |
| February | 24° | 5° | 0.5" | 5.3" | 3 | −4° – 27° |
| March | 36° | 17° | 0.7" | 5.2" | 2 | 15° – 40° |
| April | 53° | 29° | 1.1" | 3.1" | 3 | 29° – 50° |
| May | 67° | 42° | 2.7" | 0.8" | 7 | 48° – 61° |
| June | 76° | 52° | 3.7" | 0.0" | 9 | 59° – 68° |
| July | 82° | 57° | 2.7" | 0.0" | 8 | 62° – 74° |
| August | 82° | 55° | 2.0" | 0.0" | 6 | 62° – 73° |
| September | 71° | 45° | 1.7" | 0.0" | 5 | 53° – 64° |
| October | 55° | 32° | 1.4" | 2.2" | 4 | 35° – 49° |
| November | 37° | 19° | 0.7" | 4.8" | 4 | 14° – 40° |
| December | 24° | 7° | 0.6" | 9.3" | 4 | 3° – 26° |
| Year | 52° | 30° | 18.1" | 41.0" | 57 |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from -4° to 27°. June is the most reliable, staying within 9°.
Where Voltaire’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Voltaire’s center.
- Snow: Velva, ND.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Velva, ND, 5 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Voltaire’s climate
What is the weather like in Voltaire?
A typical July afternoon reaches 82°, a January night drops to 1°, and about 41 inches of snow falls in a normal winter. Colder January nights than all but 63 U.S. towns; cooler July afternoons than 84% of U.S. towns.
How cold does it get in Voltaire in winter?
January nights average 1°. About 197 nights a year reach 32° or below and 50 reach 0° or below. In the coldest January of the last 30 years the month averaged −4°.
How much snow does Voltaire get?
About 41 inches in a normal winter at Velva, ND, most of it in January and December.
How hot does it get in Voltaire?
July, with a typical high of 82° and a low of 57°. About 10 days a year reach 90° (Velva, ND).
When is the first and last frost in Voltaire?
In half of years the last spring frost (32°) comes by May 22 and the first fall frost by September 22, about 123 frost-free days, at Velva, ND.
What growing zone is Voltaire in?
Zone 4a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −28°.
What is the best time of year to visit Voltaire?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Voltaire getting warmer?
Yes: 1991–2020 averaged 1.0° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 78% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Voltaire.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.